Handle for a cosmetic brush



FIG. 1 is a front elevational view showing the design for a handle for a cosmetic brush.

FIG. 2 is a rear elevational view; and,

FIG. 3 is a side elevational view showing the design for a handle for a cosmetic brush.

The broken lines shown in the drawings, if any, illustrate portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a handle for a cosmetic brush, as shown and described. 